1. 10 people can complete 8 large jigsaw puzzles in 6 hours. The same 10 people can complete 12
small jigsaw puzzles in 3 hours. Assume everyone works at the same pace, and the puzzles of each
type are all the same size.
(a) How long will it take 6 people to complete 8 large jigsaw puzzles?
(b) How long will it take 6 people to complete 8 small jigsaw puzzles?
(c) How long will it take 1 person to complete 1 large and 1 small jigsaw puzzle?
2. (a) There was terrible traffic on the highway, and Kiran drove to work at 15 miles per hour. How
fast would he need to drive home for the average speed for his round trip commute to be 25
miles per hour?
(b) Seetha drove to work at 30 miles per hour. How fast would she need to drive home for the
average speed for her round trip commute to be 60 miles per hour?
3. Two joggers are running around an oval track in opposite directions. One jogger runs around the
track in 56 seconds. They meet every 24 seconds. How many seconds does it take the second jogger
to run around the track? (source: MATHCOUNTS)
4. Sam and Ella each drive the same number of miles per year.
Sam switches from a car that gets 26 miles per gallon to a car that gets 56 miles per gallon. Ella
switches from a car that gets 16 miles per gallon to a car that gets 26 miles per gallon.
Both Sam and Ella use fewer gallons of gasoline than they did before. Which of them saves more
gallons of gas?
